\documentclass[12pt,twoside]{article}
\usepackage[utf8]{inputenc}
\usepackage[a4paper, width=150mm, top=25mm, bottom=25mm, bindingoffset=6mm]{geometry}
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhead{}
\fancyhead[LO,LE]{\leftmark}
\fancyfoot{}
\fancyfoot[CO,CE]{\thepage}
\renewcommand{\headrulewidth}{0.2pt}
\renewcommand{\footrulewidth}{0.2pt}
\usepackage{epsfig,epic,eepic,units}
\usepackage{hyperref} %allows to add hyperlinks and cross reference in-text
\usepackage{textcomp} %this is for symbols such as copyright etc
\usepackage{url} %for adding urls obvs so they appear always in one line without breaks
\usepackage{longtable} %allows you to make tables of two or more pages
\usepackage{mathrsfs} %maths fonts, might not need
\usepackage{array} %extends array and tabular environments
\usepackage{multirow} %for tables again
\usepackage{bigstrut} %tables
\usepackage{amssymb} %adding arrows tbh for chemistry you can just use chemmacros \begin{reaction} environment
\usepackage{amsmath} %for writing maths
\usepackage{adjustbox}%supplement to graphics package
\usepackage{graphicx}
\usepackage{lscape} %allows to add certain pages in landscape
\usepackage{notoccite} %keeps rogue citations in check
\usepackage[numbers, super]{natbib} %When in doubt, this is your bibliography management package, feel free to sub for biblatex but you will need to change this, Overleaf has instructions in the Help manuals
\usepackage[nottoc]{tocbibind} %this adds bibliography to your ToC
\usepackage{chemmacros} %for chem people read the manual for this
\usepackage{textgreek} %for upright greek letters
\usepackage{siunitx} %you can declare the units you want as necessary read documentation
\begin{document}
\sloppy
\bibliographystyle{achemso} %citation style change as necessary
\include{title} %title file for the front page
\renewcommand*\contentsname{Table of Contents} %this is to have the correct heading on the ToC
\tableofcontents %make table of contents
\include{Thanks-abstact} % Abstract and Acknowledgements
%edit these to suit you, add/remove as necessary. Use \include{filetitle} to add a .tex for each chapter
\include{intro}
\include{Chapter2}
\include{Chapter3}
\include{Chapter4}
\include{Conclusions}
\include{Experimental}
\bibliography{PhD_thesis}
\include{Appendices}
%remember to either sync with Mendeley or Zotero or upload a .bib file exported from those cite using \cite{CitationTagXXXX} there will be a list it's ok
\end{document}
